Examples of org.apache.pig.impl.plan.optimizer.Rule

org.apache.pig.impl.plan.optimizer.Rule

A rule for optimizing a plan. The rule contains a pattern that must be matched in the plan before the optimizer can consider applying the rule and a transformer to do further checks and possibly transform the plan. The rule pattern is expressed as a list of node names, a map of edges in the plan, and a list of boolean values indicating whether the node is required. For example, a rule pattern could be expressed as: [Filter, Filter] {[0, 1]} [true, true], which would indicate this rule matches two nodes of class name Filter, with an edge between the two, and both are required.

        nodes = new ArrayList<String>(1);
        nodes.add(LOSTREAM_CLASSNAME);
        edges = new HashMap<Integer, Integer>();
        required = new ArrayList<Boolean>(1);
        required.add(true);
        mRules.add(new Rule(nodes, edges, required, new TypeCastInserter(plan,
                LOSTREAM_CLASSNAME)));


    }

Examples of org.apache.pig.impl.plan.optimizer.Rule

Related Classes of org.apache.pig.impl.plan.optimizer.Rule